Thank you for your recent inquiry with The Home Depot. The Viqua VH410 Whole-Home UV Water Treatment System, stainless is designed to work with a flow rate of up to 18 GPM. As long as your flow rate does not exceed that this item will work for you. We appreciate your business and look forward to serving you in the future.
Yes, this system works to kill Coliform bacteria.
Yes, VIQUA VH410 comes with a Ballast/Controller. Our apologies that it is not mentioned or shown in the description. There is a full description in the instruction/assembly and product brochure on the Home Depot website but it should be included in the description. Thank you for the feedback.
The filter has a recommended 1 year lifespan. There is an indicator light to tell you when it should be changed.
Yes, this product will help to kill iron bacteria.
It will will kill the bacteria in the iron but you would still need to do other treatment as well ahead of the UV but it will definitely help.